import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/getParameter")
public class getParameterServlet extends HttpServlet {
    //预期浏览器传来一个形容这样的请求：/getParameter?userId=123&classId=456
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      String userId=req.getParameter("userId");
      String classId=req.getParameter("classId");
      resp.getWriter().write("userId="+userId+", classId="+classId);
  }


}
